OFFSET
1,2
COMMENTS
Column 4 of A230910
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 20*a(n-1) -174*a(n-2) +877*a(n-3) -2835*a(n-4) +6037*a(n-5) -8100*a(n-6) +5354*a(n-7) +1632*a(n-8) -5940*a(n-9) +3068*a(n-10) +2069*a(n-11) -3724*a(n-12) +2559*a(n-13) +882*a(n-14) -5020*a(n-15) +2708*a(n-16) +3962*a(n-17) -3859*a(n-18) -890*a(n-19) +2032*a(n-20) -318*a(n-21) -643*a(n-22) +197*a(n-23) +81*a(n-24) -10*a(n-25) -35*a(n-26) +15*a(n-27) -a(n-28) for n>31
EXAMPLE
Some solutions for n=4
..0..1..0..3....0..2..0..3....0..2..1..0....0..2..3..1....0..1..0..1
..2..3..2..1....1..3..1..2....1..3..2..3....1..0..2..3....2..3..2..0
..0..1..3..0....0..2..0..3....2..0..1..0....3..1..0..1....1..0..3..2
..3..0..2..3....1..3..1..2....3..2..3..2....0..3..2..0....3..2..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 01 2013
STATUS
approved